Date & time Difference

Date difference calculator

From

Counting

Difference —

The same gap in other units

Days —

Weeks —

Whole weeks —

Months —

Years —

Hours —

Minutes —

Note Enter both dates

Whole calendar months, then the remainder

A calendar difference borrows from real month lengths rather than dividing by an average. From 1 January 2000 to 23 August 2026 is 26 years, 7 months and 22 days — not 26.64 years, which would be a different and less useful statement.

How to find a date difference

1 Enter the earlier and later dates.

2 Read the years, months and days breakdown.

3 The total in each unit is listed underneath.

4 Months are whole calendar months, not 30-day blocks.

The awkward case is a month-end date. From 31 January to 1 March is one month and one day, because 31 January plus one month lands on 28 February and there is a day left over. Some tools answer two days, some answer −2, and some quietly give up. Anchoring the calculation on adding whole months — which clamps a short month properly — is the only approach that gets every pair right.

Questions

How is a date difference calculated? −

By adding whole calendar months to the earlier date until adding one more would overshoot, then counting the remaining days.

Why not just divide by 30.44? +

What about 31 January to 1 March? +

Are months always the same length here? +

Does it handle leap years? +

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